A Pentagon report released earlier this month concludes that many American servicemen were imprisoned in the former Soviet Union during the Cold War. The "Gulag Study" was compiled by researchers for the U.S.-Russia Joint Commission on POW/MIAs, who have been investigating reports of Americans held in the vast network of Soviet forced labor camps. "I personally would be comfortable saying that the number [of Americans in the gulags] was in the hundreds," Norman Kass, executive secretary of the commission's U.S. section, said when the report was released. For more than a decade, researchers have investigated sightings of Americans in Soviet...